Add dependencies.yml for dependencies.io

Welcome to dependencies.io! This PR contains an initial dependencies.yml configuration to get you started. It is based off a few files that we detected in your repo and officially support. This is really just meant to get you started though, so be sure to check out our docs to get an idea for all the other dependencies you have that can be painlessly managed with dependencies.io!

https://www.dependencies.io/docs/

When the PR is merged, we'll automatically start your first build.